I thought there was also an increased chance in obtaining the pet when you reached level 99 and level 120. Looking at the formula, the increased chance seems to be linear for any level. Shouldn't there be an additive for level 99 and 120 as well, just like for having 200M xp in the specific skill?

Mod Timbosaid: What we will not be doing is listing every single method for every single skill; the only cases in which we explicitly prohibit Skilling Pets from being obtained are typically temporary events and Treasure Hunter items such as proteans and dummies (although sometimes exceptions are made, like with 2017 Christmas XP activities).

Just to be clear -- If I'm training Divination at the Incandescent Colony but using an Elder Divination outfit and an aura* (additional to other non-MTX boosts), am I eligible to be awarded Willow?

*I'm pretty sure auras don't count as MTX, but a case could be made for it. So, I thought I'd just mention that I'm using them, too, for the sake of clarity.